CVE-2026-12517: Unknown Fediverse Embeds

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

The Fediverse Embeds WordPress plugin before 1.5.8 does not validate the destination of the server-side request performed by an unauthenticated site-info endpoint before fetching it, allowing anonymous users (the gating nonce is exposed on public pages carrying an embed) to make the site request internal and private-network URLs and read back the parsed page metadata. This is a Server-Side Request Forgery.

Affected products

• Unknown Fediverse Embeds: before 1.5.8 (fixed in 1.5.8)

Published 2026-07-09. Last modified 2026-07-09.